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troubleshootingAugust 13, 2026•5 min read•RTSPLink Dev Team

Fixing OpenCV "h264 @ error while decoding MB" Console Warnings

Suppress and eliminate FFmpeg macroblock decode warnings caused by packet loss in OpenCV.

#OpenCV#FFmpeg Warning#Macroblock#Python#Debugging
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#1Eliminating the Warning

This warning occurs when UDP packets are dropped mid-frame. Switching transport to TCP resolves packet drops:

os.environ["OPENCV_FFMPEG_CAPTURE_OPTIONS"] = "rtsp_transport;tcp"

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